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Finding the Fourth Proportional to 85,477.80, 117,892.11 and 79,748.28

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Solution

The fourth proportional to 85,477.80, 117,892.11 and 79,748.28 is: 109,989.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,477.80 : 117,892.11 = 79,748.28 : x
  2. Step 2: Convert to fraction form
    85,477.80/117,892.11 = 79,748.28/x
  3. Step 3: Cross multiply
    85,477.80x = 117,892.11 × 79,748.28
  4. Step 4: Simplify right side
    85,477.80x = 9,401,692,998.07
  5. Step 5: Solve for x
    x = 9,401,692,998.07/85,477.80
  6. Step 6: Final answer
    x = 109,989.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.